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Module 6: Introduction to Modeling and Simulation

202214m

Explain system modelling. Write differences between continuous and discrete event.

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System modelling

System modelling is the process of developing a mathematical, logical or computer representation of a real system so that its structure, behaviour and interactions can be studied. A model contains the important entities, variables, relationships, inputs and outputs of the actual system.

Continuous vs. discrete-event systems

Continuous system Discrete-event system
State variables change continuously with time. State changes occur at specific points/events.
Usually represented using differential/algebraic equations. Usually represented using event logic, state transitions and queues.
Time advances continuously. System state changes when an event occurs.
Example: temperature variation, fluid level, motor speed. Example: arrival/departure of jobs, machine failure/repair, production-line queues.

In short: Continuous simulation tracks continuously varying quantities, whereas discrete-event simulation tracks changes caused by individual events.

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